Which abbreviation would indicate a medication should be taken in the morning?

The abbreviation "AM" stands for "ante meridiem," which is a Latin term meaning "before noon." It specifically indicates the morning hours, so when a medication is prescribed to be taken in the morning, it is appropriate to use this abbreviation. By recognizing "AM" in medication instructions, both healthcare providers and patients can understand that the medication should be administered in the morning, ensuring correct timing that may be important for the medication's effectiveness or to align with the patient's routine.

The other abbreviations serve different purposes: "AC" refers to taking medication before meals, "PM" means "post meridiem" or after noon, indicating that medication is to be taken in the evening or night, and "HS" stands for "hora somni," which means at bedtime. Understanding these distinctions is essential for proper medication management and adherence to prescribed routines.